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I'm at the point where all my mods I have, and will get, will all bolt on to any M50/2 engine. That way I can still swap in a US M3 engine and have all my mods carry over to the new engine (minus software). I have also considered just going an ODB-1 conversion, as previously started, it is illegal, but as long as you pass emissions no one is going to care/know until you try to sell the car.

Keeping in mind hp numbers alone don't make your car faster. Reducing weight in key areas can make a huge difference (wheels, flywheel) in more then just acceleration.

Also, installing a new M3 engine (S54) or new M5 engine is not worth the cost. It'd probably be cheaper to get like 6 turbos going on your current engine then getting an S54 in and working.

__________________"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. Itís habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, Iím Nelson, and Iím a drivaholic."

Yopu can only get one for your car, its called the Shark Injector by Jim Conforti, and it doesnt do much. 10 hp and 10 tq if your lucky. Ask MP328, he has one and says it doesnt do anything and its $350 US!

Originally posted by Alan Thinair: what are the pulleys and flywheel and what do they do?

Well, the general idea behind pullies is to make the power steering pump, alternator, and water pump spin slower, freeing up some horsepower. This is done by either replacing the crank pulley with a smaller one, or replacing all the accessory pullies with larger ones. Also the lightening of the pullies helps the engine spool/rev a little quicker too.

A lightweight flywheel doesn't actually give you any extra horsepower, but gives you a lot quicker engine response. The engine spools/revs a lot quicker, and the acceleration is pretty noticable within the first two gears. The lighter flywheel also assists in rev-matched downshifts because you can get the engine to the drivetrain/gear speed alot quicker before releasing the clutch.

The only real problem is that both the stock flywheel and the stock crank pullies have vibration dampers, so one of them should remain attached to the crank. If you want to run pullies and a lightened flywheel, get the pullies that replace the accessory pullies only.

Also, I plan on getting software (Shark Injector) for the sheer fact that it removes the speed governer (and raises the redline to 7000rpm), not that I ever planm on going that fast.

__________________"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. Itís habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, Iím Nelson, and Iím a drivaholic."